高精度高速度曲面建模的3维地表模拟和漫游算法  

3D Simulation and Walk-through Algorithm of Terrain Based on High Accuracy and Speed Surface Modeling

作　　者：闫长青[1,2] 岳天祥[1] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101 [2]山东科技大学信息工程系,泰安271019

出　　处：《中国图象图形学报》2010年第7期1126-1132,共7页Journal of Image and Graphics

基　　金：国家科技支撑计划(2006BAC08B0505)

摘　　要：3维真实感地形场景是生态系统模拟、虚拟地理环境和3维GIS不可或缺的要素,而高精度高速度曲面建模方法可以动态实时构建高精度曲面模型。论文引入高精度高速度曲面建模方法,提出了一种可以动态生成地表模型并实时绘制和漫游3维真实感地表的方法。该方法实时动态建立高精度DEM(digital elevation model),结合改进的视点依赖多分辨率绘制方法,随视点改变动态重建并绘制当前DEM。首先建立当前可见场景的DEM,然后通过依赖于视点的简化等处理建立层次细节模型,进行实时场景绘制和漫游,随视点改变,在当前场景基础上动态加点和减点更新DEM及层次细节模型,生成当前可见场景,依次循环。实例测试表明,算法可产生真实感较强的场景,实时漫游效率较高,模拟精确。Real-time generation of realistic 3D-terrain is essential in ecosystem modeling, virtual geographical environment and 3D GIS. Based on high accuracy and speed surface modeling（HASSM） ,which can be used to construct surface model dynamically, a new real-time simulation and walk-through method is proposed for constructing terrain model and rendering in real time. Firstly, the current visible terrain model is constructed accurately and rapidly. Then, multi-resolution model for rendering is built using a modified view-dependent level of detail（LOD） method. Thirdly, while walking through the terrain model, the changing model is generated in real-time by adding the new visible point and deleting the invisible points locally, and also the corresponding LOD model. The procedure is iterated unless walk-through is stopped. Test of data shows the method can make nearly real scene and obtain high efficiency and accuracy of walk-through.

关 键 词：高精度高速度曲面建模 3维地表模拟 层次细节模型 纹理融合 场景漫游 实时绘制 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]